Your gig car has 190,000 miles on it, the transmission is slipping, and someone at the hub told you to "buy before December 31 and write the whole thing off." This post is for the rideshare, delivery or 1099 driver weighing that advice this autumn.
Short answer: buy before year-end only if you need the car anyway. For 2026, bonus depreciation is 100%, but an ordinary car under 6,000 lb is capped at $20,300 of first-year depreciation, multiplied by your business-use percentage. You need more than 50% business use, the car must be delivered and in use by December 31, and taking it means you can never use the standard mileage rate on that car. For a high-mileage driver, the 76¢ standard rate is often worth more over the car's life than a big first-year write-off.
What "write it off" really means for a car
A car is not an expense you deduct the day you buy it. It is an asset you depreciate, and you get to choose how, once, in the first year the car is used for business. You have two methods:
- Standard mileage rate. 76¢ for every business mile driven from July 1 to December 31, 2026 (it was 72.5¢ before July 1). Depreciation is already built in. The IRS treats 35¢ of each 2026 business mile as depreciation, which lowers the car's basis.
- Actual expenses. Gas, insurance, repairs, tires, registration, loan interest and depreciation, all multiplied by your business-use percentage. This is the only method that lets you take bonus depreciation or section 179.
Bonus depreciation does not make the deduction bigger over time. It moves it earlier. You can never depreciate more than your business share of what the car cost. Bonus lets you take most of it in the first year, so later years get less.
The four rules that decide whether a year-end purchase helps
1. The car must be placed in service by December 31
Depreciation starts when the car is placed in service, meaning ready and available for its business use. Signing on December 30 and picking up on January 2 makes it a 2027 car. If a dealer is waiting on a delivery, assume it may slip.
2. Business use has to be over 50%, and stay over 50%
Cars are "listed property." Publication 463 says section 179 and bonus depreciation are only available if more than 50% of the car's use is qualified business use. Commuting is not business use. If business use falls to 50% or less in a later year of the recovery period, you have to add back the excess depreciation as income.
Business use is measured in miles: business miles divided by total miles for the time you owned the car that year. Buy in November, and your 2026 percentage comes from November and December alone. Starting the car's log on the day you get the keys matters more than any other record here.
3. A cap on ordinary cars
Rev. Proc. 2026-15 sets the 2026 depreciation limits for passenger cars, a category that also covers trucks and vans under 6,000 lb gross vehicle weight:
| Year of ownership | Cap with bonus | Cap without bonus |
|---|---|---|
| 1st year (2026) | $20,300 | $12,300 |
| 2nd year | $19,800 | $19,800 |
| 3rd year | $11,900 | $11,900 |
| Each later year | $7,160 | $7,160 |
The caps apply to a car used 100% for business. At 85% business use, the first-year cap with bonus is 85% of $20,300, or $17,255. Vehicles over 6,000 lb gross vehicle weight (many full-size SUVs and pickups) are not under these caps, but they have their own section 179 limit. If that is what you are looking at, ask a tax pro to run it.
4. Once you choose actual expenses with bonus, standard mileage is gone for that car
Publication 463 says you can't use the standard mileage rate on a car after claiming section 179, the special (bonus) depreciation allowance, or any depreciation method other than straight line. It works the other way too: to keep the standard rate available for a car you own, you must use it in the car's first business year. That first year is 2026 if you buy now, so this is a one-time decision. We cover it in more detail in standard mileage vs actual expenses.
A worked example (illustrative numbers)
Say you pay $24,000 for a used sedan, take it home on November 3, 2026, and drive it 5,000 miles before December 31, of which 4,250 are business. That is 85% business use. Bonus applies to used cars as long as you haven't owned or used that car before.
| Standard mileage | Actual expenses + bonus | |
|---|---|---|
| 2026 car deduction | 4,250 × 76¢ = $3,230 | Depreciation: lesser of $20,400 (85% of cost) and $17,255 (85% of the cap) = $17,255, plus 85% of two months of gas, insurance and repairs |
| Depreciation used up in 2026 | 4,250 × 35¢ = $1,487.50 | $17,255 of your $20,400 business basis |
| 2027 and later | Your choice of method each year (straight-line if you switch to actual) | Actual expenses only. About $3,145 of basis is still undepreciated; when you can deduct it depends on how the bonus year was handled (a Rev. Proc. 2019-13 safe harbor exists), which is a question for your tax pro |
| Records needed | Mileage log; tolls and parking receipts | Mileage log and every receipt, Form 4562 |
On the 2026 return, bonus clearly wins. Over several years it depends on how much you drive. After year two, the bonus car's deduction is 85% of whatever gas, insurance and repairs actually cost. The standard-rate car still earns 76¢ (or whatever the rate is then) for every business mile, whatever the car cost. A driver logging 30,000 to 40,000 business miles a year should run both sets of numbers for the years they expect to keep the car before committing. If your operating costs per mile are well under the standard rate, as they are for many efficient cars, the standard rate can come out ahead by the second or third year.
Two more things to know. Without bonus, a car that is your only business asset and is placed in service in October, November or December usually falls under the mid-quarter convention, so its regular first-year depreciation is small. That is one reason dealers talk about "bonus." Section 179, unlike bonus, can't exceed your business income for the year, so a driver who only had a small profit can't use it to create a loss.
What the deduction is worth in cash
A deduction lowers your taxable profit. It does not lower your tax bill dollar for dollar. For a driver in the 12% income tax bracket who also pays self-employment tax (15.3% on 92.35% of profit), each extra $1,000 of deduction saves very roughly a quarter of that, before smaller effects like the qualified business income deduction. In the example, the extra $14,000 or so of first-year deduction is worth a few thousand dollars in tax. That does not justify spending $24,000. It is a nice extra on a car you were going to buy anyway. Our guide to how much to set aside for taxes explains what your set-aside rate actually covers.
What happens to the old car
Since 2018, trading in a car is treated as selling it. Every business mile you claimed at the standard rate lowered that car's basis (33¢ a mile for 2025, 35¢ for 2026), so a trade-in that feels like a loss can still be a taxable gain. Selling a car after claiming standard mileage walks through the worksheet. If both cars are on the road in 2026, keep a separate log for each. Two cars or a mid-year switch shows how.
A decision checklist for October to December
- Would you buy this car in January anyway? If not, the tax saving alone almost never justifies it.
- Will business use stay above 50% for the next several years, not just this one?
- Can you take delivery and start driving it for work before December 31?
- Is the vehicle under 6,000 lb gross vehicle weight? Then the $20,300 cap (times business use) is your ceiling for 2026.
- How many business miles a year will you drive in it? The more you drive, the better the standard rate looks over the car's life.
- Are you ready to keep every receipt for as long as you own the car? Actual expenses means paperwork for good.
- Ask a tax pro before you sign if the vehicle is over 6,000 lb, you are financing or leasing, you have other business assets, or business use is near 50%. Leases follow different rules: whichever method you pick in the first year applies for the whole lease.
How TaxMiles helps, and what it doesn't do
The number that matters in all of this is business-use percentage, and the IRS wants it backed by a log. TaxMiles records drives automatically, prices each business mile at the rate for its date (72.5¢ before July 1, 76¢ from July 1), and lets you log odometer readings for each car. A reading on the day the new car arrives and another on December 31 bracket its first year.
On the free plan, TaxMiles automatically tracks up to 40 business trips a month and shows every trip and your deduction totals. You can also enter odometer readings and expenses. A full-time driver will likely go over 40 trips. Pro ($7.99 a month or $59.99 a year) removes the trip limit and adds multiple vehicles, every export, and the tax tools. Those include Compare Methods, which sets your standard-mileage deduction against your logged actual expenses for a tax year, and Vehicle Basis, which tracks how much of a car's basis your mileage has used up and estimates the gain when you sell.
Be clear about its limits. Compare Methods estimates depreciation on a simple straight-line basis. It does not model bonus depreciation, section 179 or the luxury-auto caps, so it won't tell you what the first-year bonus is worth. Use it to see your ongoing per-mile costs, and let a tax pro do the Form 4562 math. TaxMiles doesn't file returns or pick a method for you.
Sources: IRS "Standard mileage rates" page (72.5¢ through June 30, 2026; 76¢ from July 1, 2026) and Announcement 2026-11; Notice 2026-10 (35¢ depreciation component for 2026); Rev. Proc. 2026-15 in Internal Revenue Bulletin 2026-13 (2026 passenger-auto depreciation caps and 100% bonus for property acquired after January 19, 2025); Publication 463 (standard mileage rate restrictions, more-than-50% business use); Publication 946 (placed in service, mid-quarter convention, section 179 income limit). Checked October 3, 2026. This is general education, not tax advice.
Frequently asked questions
Can I write off the whole car if I buy it before December 31, 2026?
Not for an ordinary car or crossover. Bonus depreciation is 100% for 2026, but passenger cars, small SUVs, trucks and vans under 6,000 pounds gross vehicle weight are capped at $20,300 of first-year depreciation (Rev. Proc. 2026-15), and the cap is multiplied by your business-use percentage. You also need more than 50% business use, and you must use the actual-expense method for that car.
Does the car have to be delivered by December 31?
Yes. Depreciation starts when the car is placed in service, which means ready and available for its business use. A car you sign for on December 30 but pick up on January 2 was placed in service in 2027.
If I take bonus depreciation, can I go back to the standard mileage rate later?
No, not for that car. Publication 463 says you can't use the standard mileage rate on a car after claiming section 179, the special depreciation allowance, or depreciation by a method other than straight line. To keep both options open, use the standard rate in the car's first business year.
What mileage rate applies to a car I start driving for business in November 2026?
76 cents a mile. The IRS raised the 2026 business rate from 72.5 cents to 76 cents for miles driven on or after July 1, 2026, so every business mile in a car bought this autumn is at 76 cents if you use the standard rate. Tolls and business parking are deductible on top.
Is it worth buying a car just to lower my taxes?
Rarely. A deduction lowers taxable profit, not your tax bill dollar for dollar. For a driver in the 12% bracket who also pays self-employment tax, a $1,000 deduction saves very roughly a quarter of that. Spending $24,000 to save a few thousand only makes sense if you needed the car anyway.
Start the new car's log the day you get the keys
Your business-use percentage decides whether bonus depreciation is even an option. TaxMiles records every drive automatically and keeps dated odometer readings for each car.
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